sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque, and conchoidal fracture without distinct crystal cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to dull luster, opaque, and conchoidal fracture without distinct crystal cleavage.
Formation & geological history
Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, polished cabochons, and decorative jewelry.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its toughness.
Field identification & locations
Identified easily by its opaque, earthy yellow-brown or reddish color and smooth water-worn texture found in stream beds worldwide.
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